/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package cz.muni.pa036.hockeyStats;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

/**
 *
 * @author skvedo
 */
@WebServlet(name = "PictureLoader", urlPatterns = {"/PictureLoader"})
public class PictureLoader extends HttpServlet {

    @Resource(name = "jdbc/db")
    private DataSource source;

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String idS = request.getParameter("id");
        int id = -1;
        response.setContentType("image/jpeg");
        OutputStream out = response.getOutputStream();
        try {
            id = Integer.parseInt(idS);
        } catch (NumberFormatException ex) {
            out.close();
        }

        PreparedStatement pst = null;
        try {
            Connection connection = null;
            try {
                connection = source.getConnection();
                pst = connection.prepareStatement(
                        "SELECT Photo FROM Person WHERE id=?");
                pst.setInt(1, id);
                ResultSet result = pst.executeQuery();
                result.next();
                Blob blob = result.getBlob("Photo");
                InputStream is = blob.getBinaryStream();
                byte[] buffer = new byte[1024]; // Adjust if you want
                int bytesRead;
                while ((bytesRead = is.read(buffer)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
                is.close();
            } catch (SQLException ex) {
                Logger.getLogger(NewServlet.class.getName()).log(Level.SEVERE, null, ex);
                if (connection != null) {
                    try {
                        connection.close();
                    } catch (SQLException ex1) {
                        Logger.getLogger(PictureLoader.class.getName()).log(Level.SEVERE, null, ex1);
                    }
                }
            } finally {
                try {
                    if (connection != null) {
                        connection.close();
                    }
                    if (pst != null) {
                        pst.close();
                    }
                } catch (SQLException ex) {
                    Logger.getLogger(PictureLoader.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
